Leak-proof fountain pen



Aug. 33, N46. B. GRAFTQN LEAK-PROOF FOUNTAIN PEN Filed Aug. 4, 1.944

Patented Aug. 13, 1946 UNITED STATES PATENT QFFICE 1 Claim.

The purpose of my invention is to provide apen with a rotary valvestructure, consisting of three cylindrical parts held in superposedrelation by a rivet, the center cylinder valve alone being rtated in amanner that acts as a shutoff in the flow of the ink from the ink barrelto the pen point. This is a novel means of making the pen leak proof.Thi is accomplished by having the cap turn a cylinder which opens 01'closes the flow of the ink.

' Referring to the drawing:

Figure 1 is a fragmentary view of the pen and cap.

Figure 2 is a sectional View on line 2-2 of Figure 1.

Figure 3 is a cross sectional view on the line 3-3 of Fig. 4.

Figure 4 is a sectional view on the line 4-4 of Fig. 3.

Figure 5 is similar to view shown in Fig. 3 showing segment turned partof a revolution.

Figure 6 is a cross section of line 6-6 of Fig. 5.

Figure '7 is a detail view, partly broken, showing pen point rest andink channel.

Figure 8 is an end view of ink channel.

Figure 9 is outside view partly broken of por tion of barrel of penpoint holder.

Figure 10 is an end view of Fig. 9.

Figure 11 is a cross section of the cap showing projections and threadedportion.

I attain these objects by the means illustrated in the drawingaccompanying thi specification, in which i shows the entire pen; 2 isthe cap of the pen; 3 shows the projections which set into the keywaysof the revolving cylinder 4 and into the grooves 5; the cap shown as 2has a thread shown as 6 which is turned onto the threaded portion shownas I of the body of the pen shown as I. The 8 is the pen point restshowing the ink channel 9 through which the ink flows to the pen pointI0; the pen rest is tapered so that it fits into the opening 19a of thepen shown as I; the rivet II holds together part A as the pen point restand pen point holder, with the revolving center cylinder part B whichacts as the ink cut-ofi valve; part C is the barrel portion of the penalso held by rivet I I. A gasket is fitted at I2 into the grooves of Aand B. The ink flows from the interior I3 of the barrel through thechannel 9 in part A, B and C. The gasket I4 is set in B and C intorecesses which provide a seal against the leakage of the ink to theexterior and also acts as a tightening means between the parts C and B.The part B, which revolves around the rivet II also turns and closes thechannel 9 which passes through parts C and A. When the channel 9 isbrought into a continuous straight alignment with parts A, B and C, acontinuous flow of ink goes through the channel 9 from the interior ofthe barrel I3 into the opening, I0, of the pen as shown in Figure 3. Thethree projections 3 of the cap 2 set into the keyways which are a partof the cylindrical part B, shown at 5 and are spaced 120 degrees apart,

n or one third of the circumference interiorly within the cap; thus whenthe cap is screwed into the pen as shown at 6 and I, the B cylinder isalso caused to revolve and the ink channel in part B is turned away fromthe channel of A 15 and C. The channel 9, is then closed as shown inFigure 5 by the turning of cylinder or part B. A gasket I5, is placed inthe barrel part C, making this area moisture tight. The portion shown as16 may be extended to enable an in- 20 terior bladder for the ink to besealed onto the said portion IS. The circular projections 11 shown inthe Figures 3 and 5 fit into the'circular recess IIa of the cylinder B.The circular projections I8 in Figures 3 and 5 fit into the circularrecess I8a of the barrel C. The rivet shown as H, is tightly held by adriving fit to the interior centers of parts A and C as shown in Figs. 3and 5. The part B fits loosely on the rivet as shown in Figs. 3 and 5.Thus only part B is rotatable on the rivet.

To carry out the purpose of my invention, slight changes may be made inthe construction of my leak proof pen without departing from the broadscope of my invention.

What I claim as new and useful is:

portion adapted to be rotated to open or close the valve around therivet; said rivet holding together three divisions of the pen; turningthe center portion by 120 degrees being sufficient to operate the valve;each of the three parts having a channel and the channels registering inone position of the part B and when part B is rotated, its channel goingout of registry with the channel in each of the other two parts; a capcovering the pen which has three projections therein which extend intogrooves of the center cylinder; said cap engaging the center portion andclosing or opening the valve as the cap is screwed on or on"respectively.

BERNARD GRAFTON.

